It's not an easy calculation to make, but one that makes sense for all patients.

Ranking schools is always controversial, and this year a group of 38 superintendents(地區教育主管)from five states wrote to ask that their schools be excluded from the calculation.

Whether this is right, and if so where and when the ecological axe will fall, is hard to determine with any precision—which is why governments and financial institutions are only beginning to bring such risks into their economic calculations.

billion in the month, are subtracted in the calculation of gross domestic product.

These "thought experiments" were pages of calculations signed and submitted to the prestigious journal Annalen der Physik by a virtual unknown.

was known as a young genius in math calculations

We can invent computers capable of processing ten million calculations per second.